Alcatel I series User Manual page 66

Oxygen pumping
In certain applications, mixtures containing oxygen at different concentrations,
or even pure oxygen, are used.
Oils of mineral origin are combustible. Exposure to pure oxygen at high
temperatures may cause them to self-ignite. In addition, they are highly
oxidized during pumping and quickly lose their lubricating properties. Mineral
oils must not be used for oxygen levels of over 21
%
in pumped gases. In this
case, perfluorinated synthetic oils must be used, see list on
page 67.
The use of these oils requires a special pump preparation
(see
page 88).
The pump must be completely disassembled and all traces oil mineral oil
removed. Flushing the oil case is not adequate.
Any accumulation of oxygen in the installation should be avoided and the
oxygen or combustible mixture should be diluted with a neutral gas at the
exhaust: the gas flow rate should be 4 times the oxygen flow rate.
Certain combustible or explosive gases require a higher degree of dilution.
Our International Support Services and Customer Services can advise you to
help solve problems of this kind.
81
I
1
I
I
I
!
"